The American Express, Chase and Citi forums primarily host discussions of their proprietary rewards programs, and this is reflected in the forum titles. However, if you read the forum descriptions you will understand that they also host discussion of other cards issued by the same banks, because there are policies and practices which are the same without regard to the rewards program.

This means that the Citi forum will host some discussion of AAdvantage and HHonors cards, but the primary place to discuss those programs will continue to be the American Airlines and Hilton forums.